Rpm regulator for fuel injection pumps

Abstract

A centrifugal rpm regulator for the fuel injection pump of an internal combustion engine is equipped with a separate, independent, rpm-responsive adjustment mechanism which rotates a cam. This cam serves as the limiting stop for a lever which controls the injected fuel quantity and it determines the maximum injected fuel quantity. The cam is linked to a plunger which is actuated by rpm-dependent fluid pressure. Axial motion of the plunger results in rotation of the cam. The cam is mounted on a pin which is affixed eccentrically and adjustably within the regulator housing.

What is claimed is: 
     
       1. In an rpm regulator for use with a fuel injection pump associated with an internal combustion engine, said regulator including a housing, rpm-dependent means, an intermediate lever, regulator spring means connected to said intermediate lever, said rpm-dependent means engaging one arm of said intermediate lever in opposition to the force of said regulator spring means causing said intermediate lever to be thereby adjusted, rpm-responsive stop means for limiting the motion of said intermediate lever, and means for supplying regulator fluid to the housing, wherein the pressure of the regulator fluid is rpm-dependent, and wherein the regulator fluid serves to interact with said rpm-responsive stop means, the improvement comprising: a cam, affixed adjustably to said housing and engageable with said intermediate lever;   a crank, connected to said cam;   a plunger, slidably disposed with respect to said housing and connected to said crank; and   a spring mounted so as to exert a force against said plunger, whereby the regulator fluid acts on said plunger in opposition to said spring, causing said plunger to turn said crank and thereby rotate said cam.   
     
     
       2. An improved rpm regulator as defined in claim 1, the improvement further comprising: adjustable stop means for limiting the axial motions of said plunger. 
     
     
       3. An improved rpm regulator as defined in claim 2, the improvement further comprising: a bushing, provided with stop means affixed thereto and with external threads, said bushing forming a cylinder within which said plunger may slide limited by said stop means, said bushing being threadedly inserted in said housing. 
     
     
       4. An improved rpm regulator as defined in claim 3, the improvement further comprising: a cap, for threaded engagement with that end of said bushing which protrudes from said housing. 
     
     
       5. An improved rpm regulator as defined in claim 4, the improvement further comprising: a lock nut, threadedly engaging said bushing; and at least one spacer disk placed on said bushing, whereby the cooperation of said at least one spacer disk and said lock nut permits the adjustment of the depth of the threaded engagement of said bushing and of said cap. 
     
     
       6. An improved rpm regulator as defined in claim 4, the improvement further comprising: adjustable, eccentric pins, affixed to the housing of the regulator to serve as pivots for said intermediate lever and for said cam, whereby an adjustment of the location of the pivotal axis of said intermediate lever and said cam is made possible. 
     
     
       7. A improved rpm regulator as defined in claim 6, wherein said cam is a bolt held adjustably and eccentrically on one of said adjustable, eccentric pins.